Manufacture of copying foils for photomechanical transfers



Patented Nov. 11, 1924.

UNITED OFFICE.

EUGEN' SEYFFERTH, OF BERLIN, GERMANY.

No Drawing.

To all whom it may concern:

Be it known that I, EUGEN SEYFFERTH, Ph. D., citizen of Germany,residing at 2 Panoramastrasse, Berlin, Germany, have in- 6 vented a newand useful Improvement in the Manufacture of Copying Foils for Photomechanical Transfers; and I do hereby declare the following to be afull, clear, and exact description of the same.

The invention relates to an improvement in the manufacture of copyingfoils or films as carriers for photo-mechanical transfers fromtransparent cellon (acetylcellulose).

In the specification to my prior Patent No. 515,117 of November 14,1921, I have described a process for subjecting the foils or films oftransparent cellon, before the object to be reproduced is printed uponthem,

for instance hand or type-writing letter press of illustrations, musicor other designs, to a preliminary treatment, which consists in rubbingthem with a mixture of glacial acetic acid and acetone.

I have now found that for many purposes it is advantageous to omit thesaid pre liminary treatment and to deaden or dull the foils oftransparent cellon, in order to prepare it for the reception of theprint tobe transferred. If for example, notes of music are printed byhand with metallic punches the punches may easily slip on the polishedsurface of cellon, as there is not 'sufficient frictional resistance,and the ink Application filed December 30, 1921.

Serial No. 526,049.

of the punches may be wiped across the surface. This possibility isavoided by employingcellon, having slightly roughened faces.

The deadening or dulling of the said foils may be effected by thewell-known methods, for instance by pressing the foils or films betweensuitably roughened and heated meta-l plates.

It will be readily understood that I do not limit mself to thistreatment, but that any other mechanical or chemical process fordeadening or dulling the bright surface of the cellon or othertransparent substances in order to adapt them to the reception of theprint may be employed within the scope of the claim.

What I claim as my invention and desire to secure by United StatesLetters Patent is:

A process, comprising submitting the surface of a transparent sheet ofcellon to a preliminary treatment with a mixture of glacial acetic acidand acetone, and slightly roughening the surface, whereby to facilitatestamping notes on the thus prepared surface.

In testimony whereof, I have signed my name to this specification in thepresence of the two subscribing; witnesses.

EUGEN SEYFFERTI-l. lVitnesses A. CONRAD CHAPIN, HELENE HoFFERMANN.

